Java Scanner - hasNextLong() Method
The java.util.Scanner.hasNextLong() method returns true if the next token in the scanner's input can be interpreted as a long value in the specified radix using the nextLong() method. The scanner does not advance past any input.
Syntax
public boolean hasNextLong(int radix)
Parameters
radix |
Specify the radix used to interpret the token. |
Return Value
Returns true if and only if the scanner's next token is a valid long value.
Exception
Throws IllegalStateException, if the scanner is closed.
Example:
In the example below, the java.util.Scanner.hasNextLong() method is used to check whether the scanner's next token is a valid long value or not in the specified radix.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//String to scan
String MyString = "Hello World 10 + 20 = 30.0";
//creating a Scanner
Scanner MyScan = new Scanner(MyString);
while(MyScan.hasNext()) {
//check if the next token is a long with radix 16
//if yes, prints long value
if(MyScan.hasNextLong(16))
System.out.println("Long value is: "+ MyScan.nextLong(16));
//if the next token is not a long
else
System.out.println("No Long Value found: "+ MyScan.next());
}
//close the scanner
MyScan.close();
}
}
The output of the above code will be:
No Long Value found: Hello No Long Value found: World Long value is: 16 No Long Value found: + Long value is: 32 No Long Value found: = No Long Value found: 30.0
❮ Java.util - Scanner
